surveying terms
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| a rod reading taken on a point of known elevation | Back Sight (BS)
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| a permanent point of known or assumed elevation from which a survey started | Benchmark (BM)
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| a unit of measurement which equals 66 feet | Chain
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| a line connecting points on the land surface which have the same elevation | Contour line
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| the process of determining the releative elevations of various points; determining elevation differences between points | Differential leveling
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| a rod reading taking place on a point of unknown elevation | Foresight
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| a satellite-based navigation system | Global Positioning System (GPS)
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| the elevation of the level line of sight of the crosshairs in the instrument with respect to the benchmark | Height of instrument
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| a temporary point for a transit while doing differential leveling | Turning point
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